CN202872424U - Lithium ion battery equalization and protection device - Google Patents
Lithium ion battery equalization and protection device Download PDFInfo
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- CN202872424U CN202872424U CN 201220564098 CN201220564098U CN202872424U CN 202872424 U CN202872424 U CN 202872424U CN 201220564098 CN201220564098 CN 201220564098 CN 201220564098 U CN201220564098 U CN 201220564098U CN 202872424 U CN202872424 U CN 202872424U
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Abstract
The utility model relates a lithium ion battery equalization and protection device, characterized by comprising a charging assembly serially connected with a lithium ion battery pack to be charged, and providing charging current and voltage; a battery voltage measuring circuit connected with a single battery in parallel in the lithium ion battery pack and collecting the voltage of the single battery; a control assembly provided with an input end and an output end, wherein the input end is connected with the output end of the battery voltage measuring circuit; a data memory connected with the output end of the battery voltage measuring circuit and storing parameters output by the battery voltage measuring circuit; and a state indicator connected with the output ends of the control assembly and the data memory and displaying the state parameters of the single battery.
Description
Technical field
The utility model relates to battery management system.
Background technology
Lithium ion battery is one of main technology of China's New-energy electric vehicle, directly affects the performance of car load in the stability of its work and useful life.The lithium ion battery group causes the difference of battery capacity because the difference of self-discharge of battery rate accumulates for a long time; In the battery use procedure, because the difference of environment for use such as temperature, battery contact internal resistance, also can cause the imbalance of battery capacity.The imbalance of these capacity can exert an influence in direct use to battery.When charging, because the capacity of car load battery is inconsistent, some cell can be filled first, stops for preventing over-charging of battery (lithium ion battery overcharges the danger that blast on fire might occur) charging process, the battery of car load is not full of like this, affects the course continuation mileage of electric automobile.During discharge, the storage battery of those long-term undercharges can be put because of frequent mistake and make battery capacity decline, and internal resistance increases, and causes the earlier period damage of storage battery, affects the useful life of battery.In order to ensure safe, efficient, the long-life operation of battery pack, must use battery balanced method to suppress above-mentioned unbalanced phenomena.At present, the equilibrium of lithium ion battery group mainly comprises energy consumption type and feedback type dual mode.The energy consumption type is to show each cell to provide parallel branch, and the cell of overtension is reached balanced purpose by the shunting transfer electrical energy.Feedback type refers to by energy converter the deviation energy between the monomer be presented back some monomer in battery pack or the battery pack.The balanced way of energy consumption type is simple in structure, is convenient to realize, its shortcoming is to produce larger energy consumption, is unfavorable for improving energy content of battery utilization ratio, and balancing speed is limited, the heating serious, for example patent 201298735Y.Theoretically, the equalization methods of feedback type has very high energy utilization efficiency.Yet when practical application, need to use the energy-storage travelling wave tubes such as a large amount of inductance, electric capacity because energy shifts between battery, circuit is complicated, and the control difficulty is such as patent 202231461U.The utility model adopts the switch element of low pressure drop to realize connection and the isolation of each cell in the battery pack, need not to use energy storage device and resistance for dissipation can realize battery balanced and defencive function.
The utility model content
For technological deficiency of the prior art, the utility model provides a kind of lithium ion battery equilibrium and protective device, it is characterized in that, comprising: charging assembly, be serially connected with lithium ion battery group to be charged, and charging assembly provides charging current and voltage; Battery voltage measurement circuit is connected to the cell in the lithium ion battery group and gathers the voltage of cell; Control assembly has input and output, and input is connected to the output of described battery voltage measurement circuit; Data storage is connected to the output of described battery voltage measurement circuit, the parameter of the output of data storage storage battery tension measuring circuit; And positioning indicator, be connected to the output of control assembly and data storage, the state parameter of positioning indicator displaying monomer battery.
Preferably, described device also comprises: the switch control assembly, be used for controlling access and the isolation of described cell, and it is connected with described cell.
Preferably, described switch control assembly comprises two control switchs, and wherein, the first control switch is serially connected with described cell, and the second control switch is connected to the first control switch and described cell.
Preferably, described control switch is realized by metal-oxide-semiconductor, triode and resistance.
The control of the utility model by the lithium ion battery group is discharged and recharged; solve series battery and discharge and recharge the unbalanced problems such as the battery pack available capacity is little, shortening in useful life that cause, lithium ion battery group charge and discharge balancing and the protective device of the problems such as the unnecessary waste of electric energy and feedback type circuit complex control difficulty when realizing avoiding the equalizing charge of energy consumption type.
Description of drawings
By reading the detailed description of non-limiting example being done with reference to the following drawings, it is more obvious that other features, objects and advantages of the present utility model will become:
Fig. 1 illustrates according to the first embodiment of the present utility model, the balanced structural representation with protective device of a kind of lithium ion battery:
Fig. 2 illustrates according to the second embodiment of the present utility model, the principle schematic of power supply equalization switch control assembly;
Fig. 3 illustrates the battery balanced Method And Principle figure of energy dissipation type in the prior art;
Fig. 4 illustrates according to the 3rd embodiment of the present utility model, the circuit diagram of battery pack low order end cell respective switch control assembly;
Fig. 5 illustrates according to the 3rd embodiment of the present utility model, the circuit diagram of battery pack mid portion cell respective switch control assembly; And
Fig. 6 illustrates according to the 3rd embodiment of the present utility model, the circuit diagram of battery pack high order end cell respective switch control assembly.
Embodiment
By reading the detailed description of non-limiting example being done with reference to the following drawings, it is more obvious that other features, objects and advantages of the present utility model will become:
Fig. 1 illustrates according to the first embodiment of the present utility model, the balanced structural representation with protective device of a kind of lithium ion battery.Particularly, originally illustrate charging assembly 1, battery voltage measurement circuit 2, control assembly 3, data storage 4, positioning indicator 5 and lithium ion battery group to be charged and corresponding switch control assembly.Described charging assembly 1 is serially connected with lithium ion battery group to be charged; Described battery voltage measurement circuit 2 is connected to the cell of lithium ion battery group to be charged, each cell series connection of described lithium ion battery group to be charged, the output termination control assembly 3 of described battery voltage measurement circuit 2 and the input of data storage 4, the input of the output termination positioning indicator 5 of control assembly 3 and data storage 4.
Battery voltage measurement circuit 2 is used for gathering the voltage of each cell.
The theory structure of switch control assembly such as Fig. 2.Control switch of each cell serial connection in the battery pack, and connect a control switch, switch access and the isolation that realizes this cell by the switching of two switches.Control assembly sends instruction by IO mouth output height control level, makes switch 1 disconnect switch 2 closures.By the state of control switch, the cell that charging has been full of or electric weight has discharged breaks away from whole battery pack, and other cell continues operation.Compare (Fig. 3) with the battery balanced method of conventional energy dissipative type, need not and connect the bypass resistance of consumption electric energy, both reduced energy consumption, avoided again the restriction of heat dissipation problem and balancing speed.
Fig. 4 illustrates according to the 3rd embodiment of the present utility model, the circuit diagram of battery pack low order end cell respective switch control assembly.Final section battery negative terminal ground connection in the battery pack.When battery charging less than or during regular picture, in this cell place in circuit.So, connecting P type metal-oxide-semiconductor Q3(IO2 and be+5V), disconnection P type metal-oxide-semiconductor Q1(IO1 is+during 5V).When the conducting of P type metal-oxide-semiconductor Q3 pipe, if Q3 right-hand member voltage be+4.2V, then its grid by divider resistance can for+2.1V, at this moment Vgs=-2.1V.Vgs=-2.1V is in the voltage tolerance range of P type metal-oxide-semiconductor, and metal-oxide-semiconductor can use by normally.After the Q3 conducting, the left end voltage of Q3 rises to+4.2V.For Q1, owing to IO1 is+5V, PNP triode B1 does not have conducting, so N-type metal-oxide-semiconductor Q2 is in cut-off state, therefore, Vgs=0 among the Q1 is in cut-off state, has stoped the current direction battery cathode.
When battery charging has been full of or discharge when being about to occur to put, this cell need to isolate (just its positive pole being become high-impedance state here) from circuit, i.e. Q3 disconnection (IO2 is 0V), and Q1 conducting (IO1 is 0V) makes circuit formation loop.For the Q3 switch, at this moment, Vd=Vs=0V, not conducting of Q3.When IO1 is 0V, positive-negative-positive triode B1 conducting, N-type metal-oxide-semiconductor Q2 conducting, the grid voltage of P type metal-oxide-semiconductor Q1 is-2.5V that Vgs=-2.5V is in the voltage tolerance range.This moment, Q1 can be in a kind of complete conducting state.
Therefore, this real Fig. 4 circuit can be finished isolation and the access of battery pack low order end battery, realizes battery set charge/discharge equilibrium and protection.
Fig. 5 illustrates according to the 3rd embodiment of the present utility model, the circuit diagram of battery pack mid portion cell respective switch control assembly.Suppose that the battery right side accesses a batteries, then battery negative terminal voltage is+4.2V.When battery works, in the place in circuit.This moment is when connecting Q3(IO2 for+5V), disconnect Q1(IO1 and be+during 5V).When the Q3 conducting, if right-hand member place voltage be+during 8.4V, its grid has+4.1V, Vgs=-4.2V, Vgs=-4.2V is in the voltage tolerance range of Q3.Q3 can use by normally.
After the Q3 conducting, left end voltage becomes+8.3V.At this moment, because IO1 is+5V that PNP triode B1 does not have conducting, so N-type metal-oxide-semiconductor Q2 is in cut-off state.With this understanding, the Vgs=0 of Q1, Q1 is in cut-off state, has stoped the current direction battery cathode.
When battery charging has been full of or discharge when being about to occur to put, this cell need to isolate (just its positive pole being become high-impedance state here) from circuit, i.e. Q3 disconnection (IO2 is 0V), and Q1 conducting (IO1 is 0V) makes circuit formation loop.When IO1 is 0V, PNP triode B1 conducting, N-type metal-oxide-semiconductor Q2 conducting, the grid voltage of Q1 is-0.2V that Vgs=-4.6V is in the voltage tolerance range of Q1.Q1 can be in a kind of complete conducting state.Because IO2 is 0V, the Vs of Q3 always than Vd greater than+4.2V, can be in a kind of high-impedance state when therefore closing.
Therefore, this circuit can be finished isolation and the access of battery pack mid portion cell, realizes battery set charge/discharge equilibrium and protection.
Fig. 6 illustrates according to the 3rd embodiment of the present utility model, the circuit diagram of battery pack high order end cell respective switch control assembly.If this cell right-hand member accesses two batteries, namely terminal voltage is+8.4V voltage, and then battery negative terminal voltage is+8.4V.When battery works, need in the place in circuit.At this moment, connect P type metal-oxide-semiconductor Q3(IO2 and be+during 5V), disconnection P type metal-oxide-semiconductor Q1(IO1 is+during 5V).When the Q1 conducting, if Q1 left end voltage be+during 12.6V, its grid has+6.3V, Vgs=-6.3V, Vgs=-6.3V is in the voltage tolerance range of Q1.Q1 can normally use.For switch Q3, owing to IO2 is+5V, PNP triode B2 does not have conducting, and therefore, Vgs=0 so P type metal-oxide-semiconductor Q3 is in cut-off state, has stoped the current direction battery cathode.
Therefore Fig. 6 circuit can be finished isolation and the access of battery pack high order end cell, realizes battery set charge/discharge equilibrium and protection.
To sum up three batteries instance analysis as can be known, two P type metal-oxide-semiconductor grid voltages become large along with the increase of battery number.Therefore, the resistance ratio of R1 and R2, R7 and R8 among the suitable adjustment of the needs figure, thus the voltage of Vgs can in the normal parameter scope, avoid P type metal-oxide-semiconductor breakdown when making conducting.
Above specific embodiment of the utility model is described.It will be appreciated that, the utility model is not limited to above-mentioned specific implementations, and those skilled in the art can make various distortion or modification within the scope of the claims, and this does not affect flesh and blood of the present utility model.
Claims (4)
1. a lithium ion battery equilibrium and protective device is characterized in that, comprising:
Charging assembly is serially connected with lithium ion battery group to be charged, and charging assembly provides charging current and voltage;
Battery voltage measurement circuit is connected to the cell in the lithium ion battery group and gathers the voltage of cell;
Control assembly has input and output, and input is connected to the output of described battery voltage measurement circuit;
Data storage is connected to the output of described battery voltage measurement circuit, the parameter of the output of data storage storage battery tension measuring circuit; And
Positioning indicator is connected to the output of control assembly and data storage, the state parameter of positioning indicator displaying monomer battery.
2. device according to claim 1 is characterized in that, described device also comprises:
The switch control assembly is connected with described cell, and the switch control assembly is controlled access and the isolation of described cell.
3. device according to claim 2 is characterized in that, described switch control assembly comprises two control switchs, and wherein, the first control switch is serially connected with described cell, and the second control switch is connected to the first control switch and described cell.
4. device according to claim 3 is characterized in that, described control switch is realized by metal-oxide-semiconductor, triode and resistance.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220564098 CN202872424U (en) | 2012-10-30 | 2012-10-30 | Lithium ion battery equalization and protection device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220564098 CN202872424U (en) | 2012-10-30 | 2012-10-30 | Lithium ion battery equalization and protection device |
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| CN202872424U true CN202872424U (en) | 2013-04-10 |
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| CN 201220564098 Expired - Fee Related CN202872424U (en) | 2012-10-30 | 2012-10-30 | Lithium ion battery equalization and protection device |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113054705A (en) * | 2021-03-11 | 2021-06-29 | 美钻能源科技(上海)有限公司 | Battery equalization device and method |
| CN114928127A (en) * | 2022-04-07 | 2022-08-19 | 嘉兴永续新能源有限公司 | Modular battery system and equalization control method |
-
2012
- 2012-10-30 CN CN 201220564098 patent/CN202872424U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113054705A (en) * | 2021-03-11 | 2021-06-29 | 美钻能源科技(上海)有限公司 | Battery equalization device and method |
| CN114928127A (en) * | 2022-04-07 | 2022-08-19 | 嘉兴永续新能源有限公司 | Modular battery system and equalization control method |
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| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20130410 Termination date: 20151030 |
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| EXPY | Termination of patent right or utility model |